<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
<script type="text/javascript">
    var now = new Date();
    var day = now.getDay();
    var week;
    switch (day) {
        case 1:
            week = "星期一";
            break;
        case 2:
            week = "星期二";
            break;
        case 3:
            week = "星期三";
            break;
        case 4:
            week = "星期四";
            break;
        case 5:
            week = "星期五";
            break;
        case 6:
            week = "星期六";
            break;
        default :
            week = "星期日";
            break;
    }
    document.write("今天是" + week);
</script>

</body>
</html>